<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <style>
    #result {
      width: 200px;
      height: 100px;
      border: 1px solid
    }
  </style>
  <title>Document</title>
</head>

<body>
  <button>点击发送请求</button>
  <div id="result"></div>

</body>

<script>
  const btn = document.getElementsByTagName('button')[0]
  const result = document.getElementById('result')
  btn.addEventListener('click', function () {
    const xhr = new XMLHttpRequest()
    //解决ie浏览器缓存问题，直接在url中后面加上一个时间戳，这样能保证每一次都能够获取到最新的数据
    xhr.open('GET', 'http://127.0.0.1:8000/ie?=' + Date.now())
    xhr.send()
    xhr.onreadystatechange = function () {
      if (xhr.readyState === 4) {
        if (xhr.status >= 200 && xhr.status < 300) {
          console.log(xhr.response);
          result.innerText = xhr.response
        }
      }
    }

  })
</script>

</html>